Recording device



Oct. 6 1925 H. DEUTSCH RECORDING DEVI GE Filed June 9. 1924 2Sheets-Sheet 1 H DEUTSCH RECORDING DEVICE 'Filed June s. 1924 Patentedoct. 6, 1925.

HERMANN DEUTSCH, 0F BERLIN-LIGHTERFELDE, GERMANY.

RECORDING DEVICE.

Application mea :une 9, 1924. serial no. 718,985.

To all whom t may comm.'

Be it known that I, HERMANN DEUTSCH, a citizen of Germany, residing. at11 Marienplatz, Berlin-Lichterfelde, Germany, have invented certain newand useful Improvements in Recording Devices. ofwhich4 the following isa specification.

This invention relates to recording devices and particularly to devicesof this kind in the form of 'a tablet. -t f The object of the inventionis to produce a recording device of exceedingly simple construction andegreat simplicity in use. The recording device in accordance with thepresent invention comprises a diaphanous sheet with an adhesive backarranged above a. sheet of material such as paper which is so thin andflexible that when a pointed instrument is passed over theftransparentsheet above it and -a slightpressure is applied the flexible sheet,whose color dilers from that of the top. sheet, is raised,

by the top. sheet at the points or lines where -pressure has beenapplied. .In other words the lower diferently colored sheet adheres tothe top adhesive backed sheet at the places where the top sheet has beenpressed against it and becomes visible at these parts "or the likeywhose properties arelsuch that v the writing sheet of Flg. 7 on anenlarged through the top diaphanous sheet. Thus, `if apointed instrumentis passed over the top sheet the line described by the said instru.-

ment will appear through the diaphanous' sheet. The'marks or vrecordsthus produced disappear when the parts of the bottom sheet that adhereto their adhesive backed top transparent sheet are separated from thelatter byl any suitable means.

The top or writing sheet consists of diaphanous elastic material' s uchas Celluloid, cellon (acetyl cellulose), hardenedvr gelatine Vthesubstance of the adhesive layer with which its :back surface is covereddoes not penetrate to the top surface of the diaphanous sheet.y Theadhesive layer ,may consist of a thin coating vof vdiaphanous substancesuch as paraiiin, wax or the like.

The bottom sheet whose color differs from that of the to sheet-ispreferably placed `upon a raised ase as for example a metal base plate.y

` By constructing the recording device in this manner it is possible toprovide that when records are made by writing Qrdrawing on theltopsurface of the writing sheet permanent copies are produced on ordinarypaper. To this end a sheet of copying paper such as carbon paper isplaced beneath the said iexible colored or dark sheet and beneath thecopying paper the sheet is placed upon which the permanent record orcopy -placed between the two said sheets.

Fig. 2 is va section on the line Il-II-tof Fig. 1.

Fig. 3 is a fragmentary section through the writing plate on an enlargedscale.

Fig. 4 is a rear view of a fragment of the back surface of the writingsheeton an enlarged scale, r VFig. 5 is a section of Fig. 4- on.vtheline Fig. 6v is a section on the line VI-VI of Fig'. 1 on'anenlarged scale. This -itgure shows how the lower colored or dark sheetis raised at the parts where the pointed instrument is raised by the topdiaphanous elastic sheet at the` parts where pressure is applied to thelatter by a suitable instrument Asuch as a pointed stick.

Fig. 7 is a front view of a-modied writing tabletaccording to theinvention,

Fig. 8 is a section on the line VIII-VIII of Fig. 7,

Fig. 9 is a front view of a fragment of scale, v

Fig. 10 is a view on an enlarged scale of a part of the sectionaccording to Fig. 8.

' Fig.. l1 is a view of the top portlonv of the writing tablet 'with thewriting plate partly drawn out and the transverse -separating-memberindicated in two positions so as to illustrate the manner in which 4anew writing plate is inserted lin the case of the tablet and Fig.f12isatop view ofV Fig. 11.

The tablet comprises a thin casing a whichvv or metal and stretchedparallel'to the top v is preferably strengthened by a sheet metal borderb and whose one wall or side has a large opening or'window c. Thewriting plate consists of a ground plate Z of sheet metal, a thin blackvor colored paper sheet e which forms the first effective part of theperpetual writing tablet, and the writing surface or sheet proper fsuperimposed upon the colored paper sheet e. The writing sheet f mayconsist of cellon or Celluloid with a smooth surface. The rear surfaceof the writing sheet f is coated with a plastic or adhesive layer gwhich may consist of transparent paraffin, wax or the like. To enablethe paraffin layer to cling more readily to the rear surface of thecellon or celluloid sheet f, this surface It is roughene'di asillustrated in Fig. 4 before the adhesive layer g is spread over thesame. The tablet is in condition for use when the plate is inserted inthe case a. Marks are produced on the tablet by passing the point of astyle or the like over the surfzgze f exposed behind the window c.

When the point of a pointed instrument is passed over the top diaphanouselastic writing sheet f while applying pressure the lines of the sheet falong which the point is drawn are pressed against the different coloredpaper sheet e and go back to their normal position or rise again whenthe pres sure ceases and in so doing raise the differ-A ent coloredpaper sheet e with them as in-` dicated in Fig. 6. The paper sheet thenbecomes visible at the lines where it adheres to the adhesive back ofthe writing sheet F. To obliterate the record thus produced it is onlynecessary to separate the adhering parts of the sheet'c from theadhesive back of the sheet f by any suitable means when the recordingdevice consists merely of the tablet d, f, g, this may be performed bymerely raising the sheet f with its adhesive back g from the dierentcolored `paper sheet e. But in the device illustrated the separation ofthe plastic-backed sheet 7', g from the paper sheet eis effected bymeans of a transverse strip i made of card-board edge of the casebetween the side edges of the casefa soas to lie above the paper sheete. Hence, when the writing plate is drawn out of the case a as indicatedin Fig. 1 the position of thel separating strip is shifted relatively tothe paper sheet e so. that the parts of the plastic-backed sheet f, gthat have been caused to adhere to the paper sheet e, are separated fromthe latter and the writing, drawing or'other marks are p thusobliterated.

In the modification shown in Figs. 7-12 the writing plate is arranged ina thin case a 'provided with an obhterating member or separating stripz" and it is-also provided with a-ground plate df Vof lsheet metales inthe device shown in Fig 2. Arranged on l the metal ground plate dhowever is a thin block or v`/writing pad Z which comprises a number ofwriting sheets perforated along the line m. Arranged above the writingpad Z lis a sheet of dark or colored copying paper or carbon paperefwhich forms the l first effective part of the perpetual writingtablet. Superimposed upon the carbon paper e 1s a plastic-backed writingsheet,

the upper surface f consist-ing of celluloid or cellon and the plasticback g consisting of transparent paraffin, waX or vthe like. Theplastic-backed sheet forms the second effective part of the perpetualwriting tablet.

The pad Z, carbon paper e and the plastic backed sheet f', g may be heldtogether at the top edge of the writing plate by a clip n. lVhen thewriting surface f in this type of tablet is written on, there isproduced, in addition to the immediately erasible record, a permanentcopy on the topmost sheet of the writing pad Z. When the writing plateis then drawn out of the case a for the purpose of erasing the writingor drawing produced on the plastic-backed sheet, the latter f', g andthe sheet of car,

tirely removed from the case a whenever a new pad Z, and if necessary, anew sheet of carbon paper e, is to be inserted, the obliterating memberor transverse strip z" is arranged to be removed laterally from the easein the directionA of the arrow o. When the member has been thus removedthe writing plate can be entirely removed. from th Acase. Theobliterating strip z" has a hafiidle g) at its right end, this handlebeing shaped so as to form a part of the sheet' metal border Z) when thestrip is in its operative position.

lVhen a new writing plate is to be introduced into the case the greaterpart of the obliterating strip i is inserted between the plastic-backedsheet f', g and thefcarbon paper c as shown in Fig. '11, Then thewriting plate is placed into its final pos1- tion in the case (L andthen the. oblitci'ating strip is shifted into the final positionindicated in Fig. 6 in which the front .end l; passes through a slotv'in the sheet 'met-al border b at the left edge of the case. The handlep of the obliterating strip z" then embracesl the two walls of the caseai as shown. in Fig. 7 and the writing tablet -is then ready forreneweduse.

In the claims the words resistive is in tended to mean: not liable to beworn 'or len injured by the style o1' instrument used in writing orproducing other records on the rial with a rear layer of adhesivesubstance,

and a second sheet differing in color from the Writing sheet and placedbeneath the latter, said second sheet bein`g thin and flexible so thatwhen the point of a pointed instrument, that imparts no color to thewriting sheet, is passed over the latter the parts of the second sheet,against which the elastic writing sheet is pressed by said instrument,vadhere to the writing sheet and are raised by .the same when thepressure of said instrument ceases.

2. Recording device comprising a base, a sheet of thin flexible materialon said base, and a diaphanousv resistive writing sheet of. elasticmaterial with anadhesive rear surface for cleaving to and raising partsof the I thin flexible sheet against which it has been pressed.

3. Recording` device comprising abase, a sheet of thin flexible materialon said base, a diaphanous resistive writing sheet of' elastic materialwith an adhesive rear surface for cleaving to and raisingk artsof thethi-n flexible sheet against whic it has been pressed, and a member forseparating the cleaving parts of saidy rear surface from said thinflexible sheet. j

4. Recording device comprisinga base, a sheet of thin flexible materialon said base, a diaphanous resistive writing sheet of elastic materialwith' an adhesive rear surface for cleaving to and raising arts of thethin flexible sheet against wliich it has been pressed, a member forseparating the cleav ing arts of said rear surface from said thin flexile sheet, the thin flexible sheet consistin'g of copying paper and avblock of detachable leaves beneath the copying paper.

5. Recording device comprising a base, :i flexible sheet on 'the baseand a second diaphanous resistiveelastic sheet above the flexible sheetwith an adhesive layer on its back surfacethe diaphanous sheet with itsrear adhesive layer eing adapted to be raised from the flexible sheetand the color of the flexible sheet differing from that ofthe diaphanoussheet. y

6. Recording device comprising a base, a flexible sheet on the base anda second diaphonous resistive sheet above the flexible sheet with anadhesive diaphanous layer on its back surface, thel diaphanous sheetwith its adhesive layerbeing adapted to be raised from the flexiblesheet and thc color of the flexible sheet differing from that of thediaphanous sheet.

7. Recording device comprising a base, a flexible sheet on the base, anda second diaphanous celluloid sheet above the flexible sheet with anadhesive diaphanous layer on its back surface, the diaphanous sheet withits adhesive layer being adapted to be raised vfrom the flexible sheetand the color of the flexible sheetdifering from that of the diaphanoussheet.

8. Recording device comprising a. base, a flexible sheet on the base anda second diaphanous sheet above the flexible sheet with an adhesivediaphanous layer on its back surface, said back surface being roughenedso as to result in a better cleavage of the adhesive layer, thediaphanous sheet with its adhesive layer being adapted to be raised fromthe flexible sheet and the'. c olor of the flexible sheet differing fromthat of the di aphanous sheet.

9. Recording device comprising a non-im- .pressible base, a flexiblesheet on the base and a second diaphanous sheet above the flexible'sheetwith an adhesive layer on its back-surface, the diaphanous sheet withits adhesive layer being adapted to be raised from the flexible sheetand the color of the lflexible sheet differing froml that of the di- Iaphanons sheet.

10. Recording device comprising a base, a flexible sheet on the base anda second ,diaphanous sheet above the flexible sheet with an adhesivediaphanous layer on its oul back surface, the diaphanous sheet with itsadhesive layer being adapted to be raised from the flexible sheet, andthe back` of the flexible sheet, being coated with material that -istransferable to another sheet and capable of producing` a mark thereon.

11. Recording device comprising a base, a flexible sheet on the base anda second diaphanous sheet above the flexible sheet with an adhesivediaphanous layer on its back surface, the diaphanous sheet with itsadhesive layer being adapted to be raised from the flexible sheet, andthe flexible sheet consisting of ,carbon copying paper.

12. Recording device comprising a base., a block of detachable writingsheets on said base, a sheet of copying Y paper on sardi block. and adiaphanousl sheet above the copying paper provided with a substratum "ofdiaphanous adhesive 'materiaL the diaphanous sheet with its substratumbeing

